Well, if you let me know how many roughly how users are on the tracker, how many torrents and how many seeders, you can do a rough traffic guess, and processor guess, and then work out how many servers would be needed to host that much volume, and then work out a price from there.

Alternatively, you could use the numbers above, to compare the amount of $2000 to other trackers e.g. PTP which has a monthly donation target of $700, if they are way off then you know they are out to "scam".

A quick bit of research will do wonders...

Joillin